loose kitchen faucet
My Moen single handle pull-down, installed 9/11, has come loose where it meets the counter and the whole thing swings around when you move the handle. I wrote Moen, and they said this can sometimes happen and we can just tighten it. So my DH did, which wasn't easy. He needed to use pliers because you really can't get a wrench up there perpendicular to the fitting. A month later, it's loose again. He tightened it again, although it's still not entirely tight now. He commented that maybe there was supposed to be a locking washer or nut or something (sorry, I don't know much, when I was in school girls only got to take home ec). Anyway, is this common? Is there a special 90 degree angled wrench you can use to tighten it? Should I contact the guy who put it in or just get another plumber to come look at it?